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R. H. ISBELL.

ROTARY ENGINE. 1

No. 251,051. Patented Dec. 20,1881.

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ROTARY ENGINE.

No. 251,051. Patented Dec. 20,1881.

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UNITED STATES PATENT Fries.

ROBERT H. ISBELL, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO GEORGE F. BETTE, OF SAME PLACE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 251,051, dated December 20, 1881.

Application filed May '7, 1881.

To all whom it may concern Be it known that I, ROBERT E. ISBELL, of the city of New York,in the county of New York and State of New York, have in ented a new and useful improvement in rotary motors, which may be worked by steam, water, or other similar power, and may also be used as a water-meter, of which the following is a specification.

My invention is constructed with a disk firmly secured at its center on a shaftand having on its periphery a piston-head. The said pistonhead so works in a stationary annular cylinder as to impart rotary motion to the said disk and thence to the shaft. Two sliding heads or abutments, moving in a direction parallel to the axis of the said shaft and operated by a camwheel on said shaft, alternately pass backward and forward through said cylinder at opposite sides thereof, and each in its turn forms the head of a cylinder, between which head and the piston-head the steam or other source of power used for operating the motoris confined. The exhaust and feed ports of the cylinder, which are operated by the movements of these 'abutments, are so arranged that the said abut ments are moved under pressures which are balanced or nearly so.

In order that my said invention may be more easily and clearly understood and more readily performed, I will give a full, clear, and exact description of the same, reference beinghad to the accompanyingdrawings, and to theletters of reference marked thereon, similar letters indicating similar parts, making a part of this specification, in which- Figure l is a front view of said motor, looking from above. Fig. 2 is a side view of said motor. Fig. 3 is a sectional view of said motor through the line 00 00 in Fig. 5. Fig. at is a sectional view of said motor through the line 3 y in Fig. 5. Fig. 5 is a direct front view of said motor. Fig.6 is a sectional view of piston-head. Fig. 7 is a cross-sectional view of piston-head, and Fig.8 is a view showing the course taken by the tubes which connect with the valves of the-cylinder.

A represents a box mounted on the frame N, and contains an annular cylinder, 0, and disk R, the disk being firmly fastened at its center (No model.)

on the main shaft S. The said shaft S extends through said motor from front to rear, and on the front portion thereof there is firmly fixed a cam-wheel, B. The disk R extends from the shaft S to the inner side of the cylinder 0, and the sides thereof fit tightly against the sides of the opening of the inner portion of the annular cylinder,in'to which it enters, or against the box A, so as to prevent the escape of steam from the cylinder. On the outer edge of said diskafixed piston-head,or preferably twojaws, r r, are fastened, and between the saidjaws is placed a piston-head, P, which is constructed with springs and rings in the same manner as the ordinary spring piston-head for straight cylinders.

O and D represent two sliding heads or abutments, which are respectively operated backward and forward through and across the cylinder O in a direction parallel to the axis of the shaft S by the connecting-rods c and d, to which they are attached. The said connectingrods are respectively fastened to the guides f f, and the said guides, being fitted on the cam g on the wheel B, slide backward and forward in the :lldOS c c and dd as the said wheel revolves. Each of said abut-ments O and D is provided with a circular opening of the same size as the inner circumference of the cylinder 0, and also with two ports,a l) and (t b ,which respectively connect with corresponding ports in the cylinder 0, and as each of said abutments is drawn forward it closes the cylinder 0 and opens the feed valve on oneside and the exhaust-valve on the other side of said abutment, and when pressed backward opens the cylinder and closes the said valves, and the movements of said abutments are alternate.

A forward motion of said motor is secured by admitting the steam or other power used through the tubes a, a, and afland exhausting the samethrough the tubes 1), b, and b into the exhaust F, whileto reversethe same the power is introduced through the tubes 1), b, and b and exhausted through the tubes a, a, and a into the said exhaust.

In using the above-described machine for the purpose of measuring water, (in which case it is not necessary to provide for reversing the same,) better results will be obtained by increasing the size of the. valves, extending the valves on the abutments O andD almost across the same, and by attaching the feed-pipes to the rear side of the box N and the exhaustpipes to the front side thereof. The quantity of water passing through the cylinder can be ascertained by attaching an indicator to the shaft S to record its revolutions.

It is also recommended that the valves be increased in size in a water-motor.

I claim as my invention and desire to secure by Letters Patent- 1'. The sliding heads or abutinents C D,having Openings to correspond with the annular cylinder, and provided with ports a a 1) b and arranged to move backward and forward through a stationary annular cylinder, 0, in a direction parallel to the axis of the shaft S, substantially as above described.

2. The combination of the box A, shaft S, disk It, piston-head, and annular cylinder 0 with the sliding heads or abutments U D, provided with openings to correspond with the annular cylinder, and having ports a a 1) b substantially as above described.

3. The combination of the box A, shaft S, disk R, piston-head, annular cylinder 0, and cainwheel B with the sliding heads or abutnients O D, provided with openings to correspond with the annular cylinder, and having poi-ts a a b b substantially as above described.

4. The combination of the box A, shaft S, disk R, piston-head, annular cylinder 0, camwheel B, tubes a a a and b 1) b and exhausttube F with the sliding heads or abutments O D, provided with openings to correspond with the annular cylinder, and having ports a a b 7/ substantia'ly as above described.

ROBERT H. ISBELL.

Witnesses:

Tnos. ALEXANDER, J r., JAMES A. PATRICK. 

